Operating Instructions
IS1 PROFIBUS 3.00 E
- Technical alterations reserved -
73
PROFIBUS DP interface for IS1+
Signal and status in operation mode ´counter´:
Counters are set to 0 during IO-Module startup.
The status bit is initialized with ´0´ = signal disturbed.
With the Reset bit in the control register the counter register is set to ´0´ and the status bit is set
to ´1´= signal OK.
In case of errors (short circuit, open circuit, bus failure ...) the status bit is set to ´0´ and will be held at ´0´ until
the next Reset. Therefore disturbances during the count procedure are recognizable via the status bit.
In case of lost Data Exchange with the AS and recover within the parameterized output holt time or in case of
CPU redundancy switch over the count procedure will not be disturbed.
Using an input pair in operation mode Up/Down counter or frequency with direction the status bits of both
channels are set to 0 = bad in case of a signal error of one of the two channels.
For
summation of 16 Bit counters
in the AS the count difference of two consecutive read cycles must be
added from the AS. Counter overflow / underflow must be detected and considered. Maximum one overflow
/ underflow within one AS cycle shall occur.
32 Bit counter with direction input
For counting without direction detection only the first input of a 32 Bit Up/Down Counter channel pair shall be
used. The direction bit must not be used by PLC in this case. Error detection of the second not used input
channel shall be set to Off. Pulses on the first input will increment the counter if the second input is open.
Pulses on the first input will decrement the counter if the second input is shorted.
Operation mode ´Frequency´
Module
Max. number
signals
per module
Operation mode
Measurement
method
Scaling
[Hz / Bit]
Resolution
[Hz]
all DIM with
Frequency-
measurement
(9470/3x in
comp. Mode)
2
Frequency 1 Hz - 1 kHz
Pulse time
measurement
0,05
+/- 0,05
Frequency 20 Hz - 20 kHz Gate time 50 ms
1
+/- 20
Frequency 5 Hz - 20 kHz Gate time 200 ms
1
+/- 5
Frequency 1 Hz - 20 kHz
Gate time 1 s
1
+/- 1
DIOM
9470/3x,
9471/35,
9472/35
(IS1+)
8
Frequency 0,1 - 600 Hz
Pulse time
measurement
0,01
+/- 0,01
Frequency 1 Hz - 3 kHz
0,05
+/- 0,05
Frequency 1 Hz - 20 kHz
0,5
+/- 0,5
4 pairs
Frequency 1 Hz - 20 kHz
with direction
0,5
+/- 0,5
